The surname Rasmussen (cognate Rasmusen) is a Danish and Norwegian surname, meaning "Rasmus' son" (the first name "Rasmus" is equivalent of "Erasmus"). It is the ninth most common surname in Denmark, shared by about 1.9% of the population.

When found elsewhere, i.e. in North America and Australia, the name "Rasmussen" or Rasmusson is a likely indication of Scandinavian family origin.

People with this name include:

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